Whilst running some tried and tested scripts to look at wait types, I came across one I had not seen before. It is a background thread that looks to see if there are dirty pages that need to be flushed to disk. Given I found it on a barely used test box, I was not worried.
To quote the ToadWorld site, 'It is a benign wait type and shouldn’t be any concern if you happen to see high values for this wait type on your systems'.
Toadworld : Dirty Page Poll Wait Type in SQL 2012